Did Quorra 2.0 with what was essentially fibre-optic lightpipe. http://www.cosplay.com/costume/475473/
It was actually pretty easy to work with- LEDs at the ends of cut lengths of clear-core light-conducting pipe (this stuff. Unfortunately, now a retired item; https://www.sparkfun.com/products/retired/10695
), simple wiring to a switch and battery, and heatshrink tubing to keep things in place.
And dammit, I am TRYING to find the build shots on my google drive, but they seem to have vanished or not have been properly shared to mine, as it was a job between both me and my boyfriend. We never put a tutorial up, but we did make a step-by-step of sorts for workmanship judging....